Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China.
Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China.
Adv Mater. 2018 May;30(21):e1800855. doi: 10.1002/adma.201800855. Epub 2018 Apr 6.
Organic solar cells (OSCs) can be unstable under ultraviolet (UV) irradiation. To address this issue and enhance the power conversion efficiency (PCE), an inorganic-perovskite/organic four-terminal tandem solar cell (TSC) based on a semitransparent inorganic CsPbBr perovskite solar cell (pero-SC) as the top cell and an OSC as bottom cell is constructed. The high-quality CsPbBr photoactive layer of the planar pero-SC is prepared with a dual-source vacuum coevaporation method, using stoichiometric precursors of CsBr and PbBr with a low evaporation rate. The resultant opaque planar pero-SC exhibits an ultrahigh open-circuit voltage of 1.44 V and the highest reported PCE of 7.78% for a CsPbBr -based planar pero-SC. Importantly, the devices show no degradation after 120 h UV light illumination. The related semitransparent pero-SC can almost completely filter UV light and well maintain photovoltaic performance; it additionally shows an extremely high average visible transmittance. When it is used to construct a TSC, the top pero-SC acting as a UV filter can utilize UV light for photoelectric conversion, avoiding the instability problem of UV light on the bottom OSC that can meet the industrial standards of UV-light stability for solar cells, and leading to the highest reported PCE of 14.03% for the inorganic-perovskite/organic TSC.
有机太阳能电池（OSCs）在紫外（UV）辐照下可能不稳定。为了解决这个问题并提高功率转换效率（PCE），构建了一种基于半透明无机 CsPbBr 钙钛矿太阳能电池（pero-SC）作为顶电池和 OSC 作为底电池的无机-钙钛矿/有机四端串联太阳能电池（TSC）。使用具有低蒸气压的化学计量 CsBr 和 PbBr 前体的双源真空共蒸发方法制备了高质量的平面 pero-SC 的 CsPbBr 光活性层。所得不透明平面 pero-SC 表现出 1.44 V 的超高开路电压和迄今为止报道的基于 CsPbBr 的平面 pero-SC 的最高 PCE 为 7.78%。重要的是，器件在 120 h 的紫外光照射后没有降解。相关的半透明 pero-SC 几乎可以完全过滤 UV 光并很好地保持光伏性能；它还表现出极高的平均可见光透过率。当用于构建 TSC 时，作为 UV 滤波器的顶部 pero-SC 可以利用 UV 光进行光电转换，避免了底部 OSC 对 UV 光的不稳定性问题，从而满足了太阳能电池对 UV 光稳定性的工业标准，并导致迄今为止报道的无机-钙钛矿/有机 TSC 的最高 PCE 为 14.03%。
